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Tunnel Vision On Monochrome Active Matrix Powerbooks

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I ran it at 190 for 4 hours today, screen is further improved. After running laptop for hour + the tunnel vision is minor. I think this is the best it's going to get. The screen looses some "sharpness" after running for the hour also.

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Barracuda:  using a food dehydrator sounds promising. Right temperature range, airflow for moisture extraction, timer — plus it avoids stink & contaminaton in your kitchen range. 
 

Have you got one to try it?

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Winner winner screen dinner!

 

It’s a PB 170 screen with a huge tunnel problem here. Corners begin to dark after a few seconds and in a two minutes nearly all of the screen is dark. According to major opinions in this thread, I will bake for three or four hours at 80-90ºC and see what happens. Also I put one silica bag in every corner after taking the picture. I’ll post the results.

37FB0E0F-A337-41F8-A7B6-37B3F88B2EE3.jpeg

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5 hours ago, GregorHouse said:

Winner winner screen dinner!

 

It’s a PB 170 screen with a huge tunnel problem here. Corners begin to dark after a few seconds and in a two minutes nearly all of the screen is dark. According to major opinions in this thread, I will bake for three or four hours at 80-90ºC and see what happens. Also I put one silica bag in every corner after taking the picture. I’ll post the results.

37FB0E0F-A337-41F8-A7B6-37B3F88B2EE3.jpeg

I am very curious to see the results of this! Hope it works!

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On 1/19/2020 at 6:59 PM, barrakuda said:

How about putting the screen in a large enough food dehydrator instead of an oven?

I like this idea, if it turns out that it is moisture.

On 10/28/2013 at 11:06 PM, uniserver said:

next we should try the bucket of rice for a week

or silica gel

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It worked pretty well actually. First pic is 10 minutes after powering on. Second pic is 20. Darkening is still there, but it improved a lot. My bad I didn’t take pictures before, but by the time the mac boots to desktop, almost all the screen was black.

 

Also, after shutting down the menu bar was still visible for a couple minutes, like if it had burned the screen.

 

I’m baking it again, but I think this is the better I can get. At least it’s usable now.

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CD7608FB-4D1D-41C7-9FCA-8F317D9B9E8B.jpeg

6C41E2BB-BCF2-44D2-BCF8-0460773EED5C.jpeg

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Second cooking was a huge success. I left the display in the oven for the whole afternoon and the tunnel effect has completely gone, while the screen still “burns” and windows and menu bars are still visible for a few seconds. Nothing to do with a passive display such as PB 100 or 140, but way more noticeable than the Portable, for example. I have to keep in mind that this laptop was my uncle’s, who used it 30 years ago to translate books, so the screen has large mileage.

 

By the way, as the case has enough room I left the silica bags inside, hoping this will prevent moisture from getting inside the display and delaying the problem to show again.

 

Thanks everybody for your help!

AF270895-AD22-48A9-AE54-6D5FF6C2EDA4.jpeg

5D1CBD07-8E59-4377-AC87-BABF150E49B9.jpeg

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Hi, nice to see. 

 

Did the screen was heated up and down ? 

 

by the way, where are you based, this SSW is unusual (Catalan I guess ?) never seen before, never thought either it was available 

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Bingo! Yes, that’s catalan. I’m from Barcelona. Not a lot of OS’s were translated to Catalan. Only 7.1 and 7.5.3 I think, or at least I have. And then nothing until Lion.

 

About the screen, I think it turned black while it was in the oven, it was hard to see. I kept it between 80 to 90ºC for about six hours twice. Temperature above the boiling point, to avoid expanding gases and I let it cool down for the whole night inside the oven. I didn’t open the door during the process to avoid abrupt thermal changes that could crack the screen.

 

I don’t know how to reseal it. In fact, I didn’t disassemble the screen itsel. I read in another post someone who tried and didn’t go very well, so I masked the back of the screen with aluminium foil and the whole screen inside the oven. The best I could think of to prevent this from happening again was to keep the silica bags inside.

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Ok, hope you and your relatives are fine from this sad situation, I have family in Spain and holding my breath for each and every one. 

 

I spent a couple of stays in Barcelona and enjoyed every minute. 

 

I have a 170 suffering from the tunnel vision as well, think I will try to cook it like you. 

 

I disassembled the screen and heated the inside with hot air, had troubles when resealing it, had to do it several times ( the image was distorted) 

 

in the end, still have the TV, the hot air didn’t cure it. 

Edited by bibilit

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We’re fine, thanks! It seems the worst is over. My wife works in a hospital and she says the situation is getting better.

 

Refering to the screen, I think the key is heating it for a long time and in a dry environment to let the moisture go out.

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Yes both are different. 

 

Tunneling is when the screen seems ok, but after a while corners are darker and darker.

the middle of the screen remains ok for a while then all the screen goes very dark. 

 

The vinegar syndrome is an issue in the polarizer. 

The issue is visible, screen seems damaged on the outside and a strong smell is present (hence the name)

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True, as I know vinegar syndrome is a common issue relative to all LCD panels, where the polarizing film glue deteriorates, making bubles, watermarks or even cracking the film. This deformations on the film causes image distortions, stains and so.

 

The tunnel effect is a particular issue of the PB 170 screen (and many others, I guess) causes by a design or manufacture defect, that let moisture get inside the screen “sandwitch”. It gets worse if you keep the computer in a cold and wet room, like a garage or basement. In my case, the computer was stored in a electric closet, where the electric meter, for almost twenty years.

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How do you keep it from tunneling? My 170 has a problem were it has 3 lines going down on the far left of the lcd when on but it goes away when i put pressure on the side of the screen. Its not the lcd cable. Thats good everybodys safe.

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14 hours ago, GregorHouse said:

I kept it between 80 to 90ºC for about six hours twice. Temperature above the boiling point, to avoid expanding gases and I let it cool down for the whole night inside the oven. I didn’t open the door during the process to avoid abrupt thermal changes that could crack the screen.

Thanks for posting your 'recipe' and the in-process pictures.  I would like to try to replicate your results with a PB180 screen that is showing signs of the tunneling issue.  It will take a bit to sort out which oven to use and the correct settings, so it may be a while before I report back, but its good to see progress here.  Also glad that you and yours are safe.

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7 minutes ago, Juror22 said:

Thanks for posting your 'recipe' and the in-process pictures.  I would like to try to replicate your results with a PB180 screen that is showing signs of the tunneling issue.  It will take a bit to sort out which oven to use and the correct settings, so it may be a while before I report back, but its good to see progress here.  Also glad that you and yours are safe.

I used a regular size oven, upper and lower heating. I think it’s better to use one of these rather than a smaller one, in order to keep a safer distance between the screen and the heating element. Don’t trust the oven’s thermostat, by the way. Buy a cooking thermometer, they’re cheap and more reliable.

 

57 minutes ago, Papichulo said:

How do you keep it from tunneling? My 170 has a problem were it has 3 lines going down on the far left of the lcd when on but it goes away when i put pressure on the side of the screen. Its not the lcd cable. Thats good everybodys safe.

I kept four silica bags in the display assembly, I hope this will do the trick, at least for some time.

About your problem with the lines, I’m not an expert, but it sounds to me like some kind of faulty contact inside the lcd panel itself. The display sandwitch is secured by a metal frame that has a lot of passing-through “legs”, that are twisted in the back of the screen. Make sure that they tight, otherwise I can’t help

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